Henning Holck-Larsen was educated at the University of Copenhagen (and what is now the Technical University of Denmark). He came to India in 1937 as a chemical engineer working for F. L. Smidth & Co. of Copenhagen. Partnering with his former schoolmate and fellow employee Søren Kristian Toubro, he set up Larsen & Toubro in 1938. The idea of L&T was conceived during a holiday in Matheran, a hill station near Bombay. Holck-Larsen was a risk-taker while Toubro was more conservative. Larsen and Toubro saw opportunities in India at time, when few Europeans had realised the country’s potential for industrial growth.

The first office of L&T, located in Bombay, was so small that only one of them could use it a time. Initially, L&T represented Danish dairy equipment manufacturers. However, the Danish imports were restricted during the World War II, forcing L&T to start a small workshop that provided servicing and undertook small jobs. The imports stopped after the German invasion of Denmark, forcing L&T to start manufacturing dairy equipment indigenously, a move that was successful.

Seeing opportunity in ship repair during wartime, Larsen and Toubro formed a new company called Hilda Ltd. Around this time, L&T also started two repair and fabrication shops. The internment of German engineers who were supposed to build a soda ash plant for the Tatas provided L&T another new opportunity.